voice to text reading in iPhone

[visu]

Hi,

I am developing one iphone app which is include the voice to text reading functionality. The main functionality is i have an audio file. while audio file playing i need to hi light particular word.

For example: If audio file including the voice like "Hello how are you",

I need to display "Hello how are you" one by one in the main view.

Can any one help me out in this issue.

Thanks in advance.